<?php

// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

use think\App;
use think\Debug;
use think\Log;

class Hook
{

	private static $tags = [];

	/**
	 * 动态添加行为扩展到某个标签
	 * @param string    $tag 标签名称
	 * @param mixed     $behavior 行为名称
	 * @param bool      $first 是否放到开头执行
	 * @return void
	 */
	public static function add($tag, $behavior, $first = false)
	{
		isset(self::$tags[$tag]) || self::$tags[$tag] = [];
		if (is_array($behavior) && !is_callable($behavior)) {
			if (!array_key_exists('_overlay', $behavior) || !$behavior['_overlay']) {
				unset($behavior['_overlay']);
				self::$tags[$tag] = array_merge(self::$tags[$tag], $behavior);
			} else {
				unset($behavior['_overlay']);
				self::$tags[$tag] = $behavior;
			}
		} elseif ($first) {
			array_unshift(self::$tags[$tag], $behavior);
		} else {
			self::$tags[$tag][] = $behavior;
		}
	}

	/**
	 * 批量导入插件
	 * @param array    $tags 插件信息
	 * @param boolean $recursive 是否递归合并
	 */
	public static function import(array $tags, $recursive = true)
	{
		if ($recursive) {
			foreach ($tags as $tag => $behavior) {
				self::add($tag, $behavior);
			}
		} else {
			self::$tags = $tags + self::$tags;
		}
	}

	/**
	 * 获取插件信息
	 * @param string $tag 插件位置 留空获取全部
	 * @return array
	 */
	public static function get($tag = '')
	{
		if (empty($tag)) {//获取全部的插件信息
			return self::$tags;
		} else {
			return array_key_exists($tag, self::$tags) ? self::$tags[$tag] : [];
		}
	}

	/**
	 * 监听标签的行为
	 * @param string $tag    标签名称
	 * @param mixed  $params 传入参数
	 * @param mixed  $extra  额外参数
	 * @param bool   $once   只获取一个有效返回值
	 * @return mixed
	 */
	public static function listen($tag, &$params = null, $extra = null, $once = false)
	{
		$results = [];
		$tags = static::get($tag);
		foreach ($tags as $key => $name) {
			$results[$key] = self::exec($name, $tag, $params, $extra);
			if (false === $results[$key]) {// 如果返回false 则中断行为执行
				break;
			} elseif (!is_null($results[$key]) && $once) {
				break;
			}
		}
		return $once ? end($results) : $results;
	}

	/**
	 * 执行某个行为
	 * @param mixed     $class 要执行的行为
	 * @param string    $tag 方法名（标签名）
	 * @param Mixed     $params 传人的参数
	 * @param mixed     $extra 额外参数
	 * @return mixed
	 */
	public static function exec($class, $tag = '', &$params = null, $extra = null)
	{
		App::$debug && Debug::remark('behavior_start', 'time');
		if (is_callable($class)) {
			$result = call_user_func_array($class, [ & $params, $extra]);
			$class = 'Closure';
		} elseif (is_object($class)) {
			$result = call_user_func_array([$class, $tag], [ & $params, $extra]);
			$class = get_class($class);
		} else {
			$obj = new $class();
			$result = ($tag && is_callable([$obj, $tag])) ? $obj->$tag($params, $extra) : $obj->run($params, $extra);
		}
		if (App::$debug) {
			Debug::remark('behavior_end', 'time');
			Log::record('[ BEHAVIOR ] Run ' . $class . ' @' . $tag . ' [ RunTime:' . Debug::getRangeTime('behavior_start', 'behavior_end') . 's ]', 'info');
		}
		return $result;
	}

}
